<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .a{
            width: 250px;
            height: 250px;
            background-color: #0fbde4;
            float: left;
        }
        .b{
            width: 250px;
            height: 250px;
            background-color: #0fbde4;
            float: right;
        }
       
    </style>
</head>
<body>
    
    <div class="a"></div>
    <div class="b">

    </div>
</body>
</html>